The results produced, within the scope of work of the laboratory, must be based on a recognized system of measurement that derives from accepted, known quantities (SI system) or other intrinsic or well-characterized devices or quantities.
The chain of comparison of measurement between these accepted, known quantities or intrinsic devices or quantities, and the device providing objective results, must be unbroken for the competent transfer of measurement characteristics, including uncertainty, for the whole of the measurement chain.
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